phoon - show the PHase of the mOON

Phoon displays the phase of the moon, either currently
or at a specified date / time.
Unlike other such programs, which just tell you how long since first
quarter or something like that, phoon shows
you the phase with a cute little picture.
You can vary the size of the picture with the -l flag, but only some
sizes have pictures defined - other sizes use @'s.